Methine dyestuffs



United States Patent 3,468,619 METHINE DYESTUFFS Roderich Raue and Hans-Peter Kiihlthau, Leverkusen,

Germany, assignors to Farbenfabriken Bayer Aktiengesellschaft, Leverkusen, Germany, a corporation of Germany No Drawing. Filed Oct. 12, 1965, Ser. No. 495,317 Claims priority, application Germany, Oct. 24, 1964, F 44,311; May 12, 1965, F 46,026 Int. Cl. D061: 3/04 US. Cl. 8-25 19 Claims ABSTRACT OF THE DISCLOSURE Dyestuffs having superior wash fastness on polyamide fibers of the formula:

in which R, R and R are lower alkyl, R, is H or --CH, R is phenyl lower alkyl, which may be substituted, phenyl lower oxyalkyl or phenyl alkenyl, and X, Y, and Z are hydrogen, lower alkyl, lower alkoxy, halo, amino, nitro cyano, carbo lower alkoxy, carbophenyloxy alkyl sulfonyl, phenyl sulfonyl carboxamide or substituted carboxamide.

The present invention relates to novel methine dyestuffs; more particularly it relates to sulphonic acid group free metbine dyestufis of the formula wherein R and R R and R have the same meaning as indicated above and R stands for CN or an optionally substituted carboxylic acid amide or carboxylic acid ester group where in the case that R denotes a carboxylic acid ester group this differs from the radical COOR, of Formula I; in Formula II the ring A and the radicals R, R R R and R may have other substituents except for sulphonic acid groups.

The novel methine dyestuffs of Formula I are obtained when a 2-methylene-indolene-iii-aldehyde disubstituted at the 3-position by alkyl, cycloalkyl or aralkyl radicals, which may exhibit an alkyl, aralkyl or aryl 3,468,619 Patented Sept. 23, 1969 radical at the 1-position, which may have a cyano, carboxylic acid amide, carboxylic acid alkylamide or carboxylic acid ester group on the carbon atom of the 2- methylene group in addition to the aldehyde group, and which may have further substituents, is condensed with cyanoacetic acid aralkyl esters, aroxyalkyl esters or aralkenyl esters, preferably in an alkaline medium when the starting components are selected to be free from sulphonic acid groups.

The reaction of the starting components is carried out in the presence or absence of a solvent or diluent with the addition of a catalyst which should preferably be alkaline Suitable solvents or diluents are those which exhibit inert behaviour under the conditions of the condensation reaction and which are capable of dissolving a sufiicient quantity of the reaction partners. Methanol, ethanol, dioxane, carbon tetrachloride, chlorobenzene and toluene are for instance suitable for application.

Suitable alkaline condensation agents are, inter alia, pyridine, diethylamine, potassium hydroxide, sodium hydroxide and especially piperidine.

The reaction can be carried out in the presence of an emulsifying agent, such as the condensation product of oleyl alcohol with 20 moles of ethylene oxide, in order to allow the dyestuif to be separated in a finely divided form.

For the preparation of the dyestulf, the starting components are condensed, for instance by heating the alcoholic solution or suspension of the reaction partners under reflux with the addition of piperidine. In addition to the substituents specified at the 1- and 3-position, the aldehyde components from the indolene series may also have other substituents in the aromatic nucleus of the indolene, such as alkyl, alkoxy, halogen, nitro, acetyl, carbalkoxy, carboxylic acid amide, carboxylic acid alkylamide, sulphonamide, sulphoalkylamide, sulphoarylide, alkylsulphonyl, cyano, amino, alkylamino, arylamino and acylamino groups. It has already been mentioned that they may also exhibit a cyano group, carboxylic acid amide, carboxylic acid alkylamide and carboxylic acid ester group on the carbon atom of the methylene group at the 2-position, this group being introduced by methods known per se, for instance by theaction of cyanogen chloride, isocyanate or chloroformic acid ester on the aldehyde component.

Suitable aldehyde components are, for instance, the following compounds:

1 ,3 ,3-trimethyl-2-methylene-indolenearr-aldehyde;

1-ethyl-3,3-dimethyl-2-methylene-indolene-w-aldehyde;

l ,3 ,3 ,5 -tetramethyl-Z-methylene-indolene-w-aldehyde 1 ,3 ,3 -trimethyl-5 -h alogeno-2-methylene-indolene-waldehyde;

1 ,3 ,3 -trimethyl-5-nitro-2-methylene-indolene-w-aldehyde;

1,3,3,7-tetramethyl-5-nitro-2-methyleneindolene-waldehyde;

1,3,3-trimethyl-5-alkoxy-Z-methylene-indolene-waldehyde;

alkyl esters such as the methyl, ethyl and benzyl esters as well as amides of 1,3,3-trimethyl-5-carboxylic acid-2-methylene-indolene-waldehyde;

1-ethyl-3,3-dimethyl-5-ethoxy-2-rnethylene-indolene-waldehyde;

1-ethyl-3,3-dimethyl-5-carboxylic acid-Z-methyleneindolene-w-aldehyde ethyl ester;

1 ,3 ,3 -trimethyl-5 -cyano-2-m ethylene-indolene-waldehyde;

1 ,3 ,3 -trimethyl-5 -acylamino-2-methylene-indolene-waldehyde;

1,3,3-trimethyl-5-amino-2-methylene-indolene-waldehyde;

1,3,3-trimethyl-5-alkylsulphonylaminoor -arylsulpony1- amino-2-methylene-indolene-w-aldehyde;

1,3,3-triethyl-2-methylene-indolene-w-aldehyde;

1,3 3-trimethylbenzo- (6,7 -2-methylene-indolene-waldehyde;

1,3,3-trimethylbenzo- (4,5 -2-methylene-indolene-waldehyde;

1,3,3-trimethyl-5-sulphonamidoand -alkylsulphonamido- Z-methylene-indolene-w-aldehyde;

1,3,3-trimethyl-5-methylsulphonyl-2-methylene-indolenew-aldehyde and 1,3,3-trimethyl-5-methoxy-Z-methylene-indolene-wcyano-w-aldehyde.

The following compounds may be employed as the cyanoacetic acid aralkyl, aroxyalkyl and aralkenyl esters:

Cyanoacetic acid benzyl esters, cyanoacetic acid 2-chlorobenzyl ester, cyanoacetic acid 4-chlorobenzyl ester, cyanoacetic acid 3,4-dichlorobenzyl ester, cyanoacetic acid 2,4,6-trichlorobenzyl ester, cyanoacetic acid 4-nitrobenzyl ester, cyanoacetic acid 4-methylbenzyl ester, cyanoacetic acid a-phenylethyl ester, cyanoacetic acid fl-phenylethyl ester, cyanoacetic acid B-hydroxy-fi-phenylethyl ester, cyanoacetic acid 'y-phenylpropyl ester, cyanoacetic acid 'y-phenylallyl ester and cyanoacetic acid phenoxyethyl ester.

The dyestuffs can be employed for dyeing according to the usual methods, from an aqueous dispersion or again by adding them to the spinning compositions prior to the spinning process during the production of synthetic fibres. Brilliant dyeings characterized by excellent fastness to light are obtained on the specified materials. The dyestuffs obtainable according to the process exhibit a better fastness towards Washing when dyed on superpolyamide fibres compared with the most closely related dyestuffs of British patent specification No. 929,393.

The novel dyestuffs are valuable products on their own as individual dyestuffs and again in the form of mixtures of at least two different dyestuff of Formula I or in the form of at least one dystutf of Formula I with at least one other methine dyestuff. Mixtures of at least one novel methine dyestuif of the formula and at least one dilferent methine dyestutf 1 R: ON A iT=CCH=C 1 I ia Rs R wherein R and R denote alkyl, aralkyl or cycloalkyl radicals, R is hydrogen, an alkyl, aralkyl or aryl radical, R is hydrogen, a cyano, carboxylic acid amide, carboxylic acid alkylarnide or carboxylic acid ester group, R is an aralkyl, aroxyalkyl or aralkenyl radical linked to O via the alkyl or alkenyl group, and R is a cyano, carboxylic acid ester or optionally substituted carboxylic acid amide group, where the ring A and the radicals RR may have other substituents, except for sulphonic acid groups, have proved to be particularly valuable.

In the case where R represents a carboxylic acid ester group, this must be different from the group --COO'R in Formula I according to the definition.

Mixtures of (I) and (II) of this type are obtained when a Z-methylene-indolene-w-aldehyde disubstituted at the 3-position by alkyl, cycloalkyl or aralkyl radicals which may exhibit an alkyl, aralkyl or aryl radical at the l-position and in addition to the aldehyde group a cyano group, carboxylic acid amide, carboxylic acid alkylamide or carboxylic acid ester group on the carbon atom of the methylene group at the 2-position and which may have other substituents, is condensed with a cyanoacetic acid ester of the formula C 0 OR; (III) and at the same time with a different cyanoacetic acid derivative of the formula preferably in an alkaline medium, when the starting components are selected to be free from sulphonic acid groups.

The reaction of the starting components is carried out in the presence or absence of a solvent or diluent with the addition of a catalyst which should preferably be alkaline. Suitable solvents or diluents are those which exhibit inert behaviour under the conditions of the condensation reaction and which are capable of dissolving a sufficient quantity of the reaction partners. The other reaction conditions are also fundamentally the same as those employed for the preparation of the individual dyestufis (I).

In addition to the cyanoacetic acid aralkyl, aroxyalkyl and aralkenyl esters of Formula III mentioned above suitable cyanoacetic acid derivatives of Formula IV also, for instance, include malonic acid dinitrile, cyanoacetic acid methyl ester, cyanoacetic acid ethyl ester, cyanoacetic acid isobutyl ester, cyanoacetic acid 3-methoxybutyl ester, cyanoacetic acid isoamyl ester, cyanoacetic acid cyclohexyl ester, cyanoacetic acid p-methylcyclohexyl ester, cyanoacetic acid tetrahydrofurfuryl ester, cyanoacetic acid methyl ester, cyanoacetic acid dichloroisopropyl ester, cyanoacetic 'acid N-methylamide, cyanoacetic acid N-ethylamide, cyanoacetic acid N-butylamide, cyanoacetamide, cyanoacetic acid N-methylanilide, cyanoacetic acid N-ethylanilide, cyanoacetic acid ,B-hydroxyethylamide, cyanoacetic acid 'y-methoxypropylamide, and cyanoacetic acid S-cyanoethyl ester.

A particular advantage of the dyestuff mixtures, in comparison with the individual dyestuffs some of which are known, consists in that the mixtures are obtained in a finely divided form even when no emulsifying agents are added to the reaction medium, and that moreover they can afterwards be converted to the dispersed form required for dyeing with appreciably less expenditure of work. Moreover, the dyestuif mixtures take better on synthetic fibre materials, and in particular on aromatic polyesters, such as polyethylene terephthalate and polyesters from terephthalic acid and 1,4-bis-hydroxymethyl-cyclohexane, and on synthetic superpolyamides than the individual dyestuffs.

The dyestuif mixtures can be employed for dyeing according to the usual methods, from an aqueous dispersion or again by adding them to the spinning compositions prior to the spinning process during the production of synthetic fibres. Brilliant dyeing characterised by excellent fastness to light are obtained on the specified materials. The dyestutf mixtures obtainable according to the process exhibit a better fastness to water when dyed on superpolyamide fibres compared with the most closley related dyestuffs of British Patent No. 929,393.

The novel dyestutf mixtures contain at least two different dyestuffs of Formulas I and II, and in the case where R is a carboxylic acid ester group this must be different from COOR An example of this last mentioned instance is provided when COOR in Formula I is a carboxylic acid benzyl ester group and the radical R in Formula II is a carboxylic acid 'y-phenylpropyl ester group.

In the following examples, given for the purpose of illustrating the invention, the specified parts by weight are related to the parts by volume in the proportion of grams to millilitres; the temperature indications are given in degrees centigrade.

EXAMPLE 1 25.9 parts by weight of 1,3,3-trimethyl-5-carbomethoxy-2-methylene-indolene-w-aldehyde and 17.6 parts by weight of cyanoacetic acid benzyl ester are heated at 90 C. in 60 par-ts by volume of dioxane, when the major fraction of the aldehyde dissolves. 0.5 parts by volume of piperidine are thereafter added dropwise and the reaction mixture is maintained a little longer at a temperature of about 90 C. A clear solution is formed after a few minutes, and this is stirred for 2 hours whilst gently boiling under reflux.

The dyestufi crystallises out on cooling. The yield becomes almost quantitative when the mixture is treated with parts by volume of methanol and cooled to 0 C. The dyestufr is filtered 011 with suction and washed with methanol (M.P. 177-178 C.).

20 parts -by weight of the resultant dyestuif are kneaded with parts by weight of a formaldehydelnaphthalenesulphonic acid condensation product and a little water until the dyestuff is present in a finely divided state. The pulp is dried in vacuo at 50 C.

A yarn of e-caprolactarn polymer is introduced at 50 C. into a dye liquor which contains, per litre, 0.66 g. of the dyestufi dispersion prepared by the method mentioned above as well as 0.5 g. of a formaldehyde/naphthalenesulphonic acid condensation product. The liquor-to-goods ratio amounts to 35:1. The liquor is heated to C. within half an hour and dyeing is carried out at this temperature for 1 hour. The yarn is thereafter rinsed and dried. A greenish yellow dyeing with excellent fastness to light is obtained. Similar results are achieved when the above described compound is replaced by the dyestuffs obtained from the starting components listed in the following table:

Aldehyde component 1,3,3-trimethyl-5-carb oruethoxy-Z-methylene-indolene-w-aldeh yde Do 1,3,3-trimethyl-Z-methylene-indolene-m-aldehyd Do 1,3,3-trimethyl-5-methoxy-2-methylene-indolene-w-aldehyde. 1,satriEuiid s ifiiiiHi -iiiiifiiii aiiiibiifiiefi dafiiii ae 0 1,3,3,5-tetramethyl-2-methylene-indolene-waldehyde Do 1,3,3-trimethyl-Ei-carbamido-2-methylene-indolene-w-aldehyde. 1,3,B-trimethyl-S-carboethoxy-2-n1ethylene-indolene-w-aldehyde.- 1,3,3-trimethy1-5-nitro-2-rnethylene-indolene-w-aldehyde 1,3,3-trimethyl-5-cyano-2-methylene-lndolene-w-aldehyde Do 1,3,3-trimeth 1-5- ethylsulphonyl-2-methylene-indolene-w-aldehyde. 1,3,3-trimethyl-5-carbobenzoxy-2-methylene-indolenew-aldehyde-.

1,3,3-trimethyl-5-(-N-ethyl)-ca 1,3,3-trimethy1-5-phenylsulphonyl-2-n1ethylene-indolene-w-aldehyde.

D o 1,3,3,7-tetramethyl-5-nitro-2-methylene-indolene-w-aldehyd 1,3,3-trimethyl-5-ch1oro-2-rnethylene-indo1ene-w-aidehyde-- D0 1,3,3-trimeth yl-5-ethoxy-2-rnethylene-indolene-m-aldehyde.

Do 1,3,3-trimethyl-5-methoxy-2-methylene-indolene-w-aldehyde- 1,3,B-trimethyI-7-ethyi-2-methylene-indolene-w-aldehyde..

Do 1,3,3-7-tetramethyl-2-methylene-indolene-araldehyde.

Do 1,3,3,5-tetramethy1-2-methylene-indolene-w-aldehyde. 1,3,3-trimethyl-5-amino2-methylene-indolene-w-aldehyde. 1,3,3,7-tetramethy1-5-nitrc-2-methylene-indolene-m-ald ehyde 1,3,3-trirnethyl-5-1nethoxy-2-methylene-indolene-w-aldehyde- 1,3,3,7-tetramethyl-2-methylene-indoleue-w-aldehyde- Do 1,3,3-trimethy1-5-n1tro-2-methy1ene-indo1ene-w-a1dehyde 1,3,3-trimethyl-T-ethyl-2-methylene-indoIene-araldehyde.. 1,3,3-trimethyl-7-ethoxy-2-methylene-indolene-w-aldehyde- 1,3,3-trirnethy1-5-methoxy-2-methylene-indolenew-aldehyde 1 ,3,3-trimethyl-5-methoxy-2-methylene-m-cyanoindolene-w-aldehyde.

1 ,3,3,5-tetramethyl-2-methylene-indolene-waldehyde- 1,3,3-trimethyl-5-carbo- -phenyl-propoxy-2-methylene-lndolene-w-aldehyde o 1,3,3,7-tetrarnethyl-fi-chloro-2-methylene-indolene-craldehyde.- Do aldehyde.

0 1,3,3,7-tetramethyl-6-chloro-2-methylene-indolene-w-aldehyde.-.

o 1,3,3-trimethy1-5-chloro-7-methoxy-2-methylene-indolene-w-aldehyde..

Do 1,3,3i?irnethyl-4-chloro-7-methoxymethy]ene-indolene-m-aldehyde..

o 1,3,B-trirnethyl-5-methoxy-2-methylene-wcyanoindolene-waldehyde do-2-methylene-indo1ene-w-aldehyde- Melting point of dycstufi Methylene compound C.)

Cyanoacetic acid benzyl ester 177-178 Cyancacetic acid 2-chlorobenzyl ester. 192-194 Cyanoacetic acid 4-chlorobenzyl estcr.... 224-225 Cyanoacetic acid 4-rnethylbenzyl ester. 209-210 Cyanoacetic acid a-phenylethyl ester 167 Cyanoacetic acid B-phenylethyl ester 175-176 Cyanoacetic acid 3,4-diehlorobenzyl ester.. 241-243 Cyanoacetic acid 'y-phenylallyl ester 202-203 Cyanoacetic acid -phenylpropyl ester-. 148-149 Cyanoacetic acid trichlol'obenzyl ester.-. 234-237 Cyanoacetie acid d-phenoxyethyl ester. 166-168 Oyanoacctic acid 4-nitrobenzyl ester 253-254 Cyanoacetic acid fl-hydroxy-B-phenyl ethyl ester 162 Cyanoacetic acid benzyl ester 109-111 Cyanoacetic acid -phenylpropyl ester 111 Cyanoacetic acid benzyl ester 171 Cyanoacetic acid y-phenylpropyl ester 190 Cyanoacetic acid benzyl ester 157 Gyanoacetic acid -pheny1propyl ester 128 Oyanoacetic acid benzyl ester 190 Cyanoacetic acid -phenylpropyl ester 184-185 Cyanoacetic acid benzyl ester 21% 16 251 208 Cyanoacetrc acid -phenylpropyl ester 200 Cyanoacetic acid benzyl ester 208 .-d0........ 160 Cyanoacetic acid -phenylpropyl ester 176 Gyanoacetic acid benzyl ester 146 ..do... 208 Cyanoacetic acid y-phenylpropyl ester 161 Cyagoacetic acid benzyl ester 205 209 Cyanoace ienylpropyl ester 198-109 Cyanoacetic acid benzyl ester 175-176 Cyanoacetic acid v-phenylpropyl est 149-152 Cyanoacetic acid 4-chl0robenzyl ester. 196-197 Cyanoacetic acid benzyl ester -127 Cyanoacetic acid 'y-phenylpropyl ester. 99-101 Cyanoacetic acid benzyl ester 134 Cyanoacetic acid -phenylpropyl ester. Oyanoacetic acid 4-chlorobenzyl ester- 196-197 Cyanoacetic acid benzyl ester- 200 Cyanoacetic acid 4-nitrobenzyl ester 242 Cyagoacetic acid 2-chlorobenzyl ester. 174-17? o 20 Oyanoacetic acid 3,4-dichlorobenzyl ester. 193 Cyanoacetic acid 2,4,6-trichlorobenzyl este 197 Cyanoacetic acid 2-chlorohenzyl ester- 203-205 Cyanoacetic acid 4-chlorobenzyl ester.. 198 Cyatriioacetic acid 3,4-dichlorobenzyl este 19g o 20 Cyanoacetic acid 2-chlorobenzyl ester. 18?

217 193 204 Cyanoacetic acid benzyl ester 155 Cyanoacetic acid 'y-phenylpropyl ester 115 Cyanoacetic acid benzyl ester 21 Cyanoacetic acid 'y-phcnylpropyl ester. 161 Cyanoacetic acid benzyl ester Oyancacetic acid y-phenylpropyl ester. 173 Cyanoacetic acid benzyl ester 181 Cyanoacetic acid -y-phenylpropyl ester-.- 166 Oyanoacetic acid benzyl ester 230 Cyanoacetic acid 'y-phenylpropyl ester- 151 Cyanoacetic acid benzyl ester 151 Cyanoacetic acid 'y-phenylpropyl ester. 118 Cyanoacetic acid benzyl ester Cyanoacetic acid 'y-phenylpropyl ester. 250 Cyanoacetic acid 'y-phenylallyl ester 129 Melting point of dyestufi Aldehyde component Methylene compound C.)

1,3,S-trimethyl-5-methoxy-2-methylene-w-cyanoindolene-w-aldehyde Cyanoacetic acid phenoxyethyl ester 154 1,3,3-trimethyl-4,6-dicarbomethoxy-2methylene-indolenew-aldehyde cyanoacetic acid benzyl ester 205 D cyanoacetic acid 'y-phenylpropyl ester 162 1,3,3-trimethyl-4,5-diehlr0-7-methoxy-Z-methylene-indolene-w-aldehy Cyauoacetic acid benzyl ester 191-192 D0 Cyanoacetic acid 'y-phenylpropyl ester 146-148 1,3,S-trimethyl-E-chloro i,7-dimethoxy-2-methylene-indolene-w-aldehyde Cyanoacetic acid benzyl ester 14 Do Cyanoacetic acid 'y-phenylpropyl ester 144 1,3,3,4-tetramethyl--chloro-7-methoxy-2-methylenedndoleue-m-aldehyde Cyauoacetic acid benzyl ester 199-200 Do. Cyanoacetic acid v-phenylpropyl ester 141 EXAMPLE 2 7 parts by weight of 1,3,3-trimethy1-5-methoxy-2-methylene-indolene-w-cyano-w-aldehyde and 4.8 parts by weight of cyanoacetic acid benzyl ester are heated at 90 C. in parts by volume of dioxane, when the major fraction of the aldehyde dissolves. 0.2 parts by volume of piperidine are thereafter added dropwise and the reaction mixture is maintained a little longer at a temperature of 90 C. A clear solution is formed after a few minutes, and this is stirred at 90-95 C. for 2 hours. The dyestufi crystallises out on cooling.

The yield becomes almost quantitative when the mixture is treated with parts by volume of methanol and cooled to 0 C. The dyestuff is filtered off with suction and washed with methanol (M.P. l57 C.).

100 parts of a fibre material of polyethylene glycol terephthalate are dyed from a liquor containing 2 parts of the resulting dyestuif and 20 parts of a carrier (cresotinic acid ester) in 4000 parts of water, first of all at 80- 85 C. for 1520 minutes and then at its boiling point for 60-90 minutes. A clear greenish yellow dyeing with an excellent fastness to light, washing and sublimation is obtained.

100 parts of a triacetate silk yarn are heated at 98100 C. for 60 minutes in a dye liquor containing 2 parts of the dyestufi obtained in accordance with the above directions, 4 parts of Marseilles soap and 4000 parts of water. A greenish yellow dyeing with very good fastness to light and wetting is obtained.

Similar good results are obtained during the dyeing of polyester materials and of triacetate materials when for instance 1,3,3 trimethyl 5 methoxy-Z-methylene-indolene-w-cyano-w-aldehyde and one of the following methylene compounds are selected for preparing the dyestuffs according to Example 2: cyanoacetic acid 'y-phenylpropyl ester, cyanoacetic acid Z-chlorobenzyl ester, cyanoacetic acid 4-chlorobenzyl ester, cyanoacetic acid 'y-phenylallyl ester and cyanoacetic acid phenoxyethyl ester.

EXAMPLE 3 28.5 parts by weight of l,3,3-trimethyl-S-carbomethoxy- 2-methylene-inodene-w-aldehyde are heated at 90 C. with (a) 17.6 parts by weight of cyanoactic acid benzyl ester and (b) 2.0 parts by weight of cyanoacetic acid 'y-phenylpropyl ester as well as with 60 parts by volume of dioxane, when the major fraction of the aldehyde dissolves. 0.5 parts by volume of piperidine are thereafter added dr0pwise and the reaction mixture is maintained a little longer at a temperature of about 90 C. A clear solution is formed after a few minutes, and this is stirred for 2 hours whilst gently boiling under reflux.

The dyestufi. crystallises out on cooling. The yield becomes almost quantitative when the mixture is treated with 60 parts by volume of methanol and cooled at 0 C. The dyestutf which consists of a mixture of the two esters is filtered off with suction and washed with methanol.

20 parts by weight of the resulting dyestufifs are kneaded with 80 parts by weight of a formaldehyde/naphthalene sulphonic acid condensation product and a little Water until the dyestuff is present in a finely divided state. The pulp is dried in vacuo at 50 C.

A yarn of e-caprolactam polymer is introduced at 50 C. into a dye liquor which contains, per litre, 0.66 g. of the dyestutf dispersion prepared by the method mentioned above as well as 0.5 g. of a formaldehyde/naphthalenesulphonic acid condensation product. The liquor-to-goods ratio amounts to 35:1. The liquor is heated to 100 C. within half an hour and dyeing is carried out at this temperature for 1 hour. The yarn is thereafter rinsed and dried. A greenish yellow dyeing with excellent fastness to light is obtained.

EXAMPLE 4 77.7 parts by Weight of l,3,3-t-rimethyl-5'carbomethoxy- 2-methylene-indolene-w-aldehyde as well as (a) 20.3 parts by weight of cyanoacetic acid 'y-phenylpropyl ester,

(b) 24.4 parts by weight of cyanoacetic acid 3,4-dichlorobenzyl ester and (c) 27.9 parts by weight of cyanoacetic acid 2,4,6-trichlorobenzyl ester are heated at C. in 180 parts by volume of dioxane, when the major fraction of the aldehyde dissolves. 1.5 parts by volume of piperidine are thereafter added dropwise and the reaction mixture is maintained a little longer at a temperature of about 90 C.'A clear solution is formed after a few minutes, and this is stirred for 2 hours whilst gently boiling under reflux.

The resultant dyestuff mixture crystallises out on cooling. The yield becomes almost quantitative when the mixture is treated with 180 parts by volume of methanol and cooled to 0 C. The dyestuif mixture is filtered off with suction and washed with methanol. Dyeings having the same colour shade and the same fastness properties as those in Example 3 are obtained on polyamide fabrics.

EXAMPLE 5 parts by weight of 1,3,3-trimethy1-5-carbomethoxy- 2-methylene-indoleneii-aldehyde are added at about 90 C. to the solution of a mixture of cyanoacetic acid derivatives to be described below and 1.7 parts by weight of piperidine are added. The aldehyde dissolves during this operation. It is stirred at 90 C. for 2 hours, cooled to 75 C. and 300 parts by volume of cold methanol are added all at once. The resultant dyestuif mixture is precipitated in a very fine state during this operation. It is cooled to 0 C., filtered off with suction and washed with methanol. Greenish yellow dyeings with very good fastness properties are obtained on polyethylene terephthalate and polyamide fabrics.

The mixture of cyanoacetic acid derivatives was obtained as follows:

180 parts by weight of benzyl alcohol, 10 parts by weight of 'y-phenylpropyl alcohol and 60 parts by weight of cyanoacetic acid ethyl ester are mixed by intensive stirring in a three-necked flask provided via a column with a distillation bridge, whilst heating at C. This starts a transesterification reaction of the cyanoacetic acid ethyl ester to produce cyanoacetic acid benzyl ester and cyanoacetic acid -phenylpropyl ester, and ethyl alcohol is distilled off.

The temperature is gradually increased to C. The calculated amount of the resulting ethyl alcohol has dis tilled off after one hour. It is then cooled to 90 C.

Similar dyestuffs are obtained when the above described compound is replaced by the starting components listed in the following table:

Colour shade of dyestufi mixture on Aldehyde component Methylene compound polyamide fabric 1,3,3-trimethyl-5-carbomethexy 2-methylene-indolenew-aldehyde. (a) Oyanoacetic acid benzyl ester; Greenish yellow.

(b) Cyanoacetic acid ethyl ester. Do (a) Oyanoacetic acid 2-chl0r0benzy1 ester; Do.

(b) Cyanoacetic acid benzyl ester. Do (a) Cyanoacetic acid 4-chlorobenzyl ester; Do.

Cyanoacetic acid benzyl ester. Cyanoacefic acid 4-methylbenzyl ester; D0. Cyanoacetic acid benzyl ester. Cyanoacetic acid a-phenylethyl ester; D0. Cyanoacetic acid benzyl ester. Cyanoacetic acid B-phenylethyl ester; D0. Cyanoacetic acid benzyl ester. Cyanoacetic acid 3,4 dichlorobenzyl ester; D0. Cyanoacetic acid benzyl ester. Cyarioacetic acid 'y-pheriylallyl ester; Do. Cyanoacetic acid benzyl ester. Cyanoacetic acid -y-pheny1pr0py1estcr; D0. Cyanoacetic acid 3,4-dich10robenzyl ester. Cyanoacetic acid trichlorobenzyl ester; D0, Cyanoacetic acid benzyl ester. Cyanoacetic acid fl-phenoxyethyl ester; Do. Cyanoacetic acid benzyl ester. Cyanoacetic acid 4-nitrobenzyl ester; Do. Cyanoacetic acid benzyl ester. Cyanoacetic acid 3,4-dichlorobenzyl ester; D0. Cyanoacetic acid 2,4,6-trich1orobenzyl ester. Cyanoacetic acid-B-hydroxy-B-pl1enylethyl ester; Do. (b) Cyanoacetic acid benzyl ester. 1,3,S-trimethyl-2methylene-indolen -w-a1dehyde (a) Cyanoacetic acid benzyl ester; D

(b) Cyanoacetic acid y-phenylpropyl ester. D0 (a) Cyanoacetic acid y-plienylpr0pyl ester; D

(b) Cyanoacetic acid -phenylallyl ester. 1,3,3-trimetl1y15-methoxy2methylene-indolene-w-aldehyde (a) Cyanoacetic acid benzyl ester; D

(b) Cyanoacetic acid -pheuylpropyl ester. Do (a) Cyauoacetic acid v-plienylpropyl ester; D

(b) Cyanoacetic acid 3,4-dich1orobenzyl ester. 1,3,3-trimethyl-5-methoxy-2-methylene-w-cyanoindolene-waldehyde (a) Cyanoacetic acid benzyl ester; D

(b) Cyanoacetic acid y-phenylpropyl ester. Do. (a) Oyanoacetic acid -pheny1propyl ester; D0,

(b) Cyanoacetic acid plienoxyethyl ester. 1,3,3,5-tetramethyl-2-methylene-ind01ene-w-a1del1yde (a) Cyanoacetic acid benzyl ester; D

(b) Cyanoacetrc acid phenylpropyl ester. D (a) Cyanoacetic acid phenylpropyl ester; Do.

(10) Cyanoacetic acid 4-chl0robenzyl ester. ,3,3,-trimethy1-5-carbamido-Z-methylene-indo1ene-w-a1dehyde. (a) Oyanoacetic acid benzyl ester; Do.

(10) Cyanoacetic acid 2,4,6-trichlorobenzy1 ester. Do (a) Cyanoacetic acid benzyl ester; D

(b) Cyanoacetic acid -phcnylpropyl ester. 1,3,3-trimethy1-5-nitr0-2methylene-indolenc waldehyde (a) Cyanoacetic acid benzyl ester; D

(b) Cyanoacetic acid 'y-phenylpropyl ester. 1,3,3-trimethyl-fi-cyano-Z-methylene-ind01enew-a1dehyde (a) Gyanoacetic acid benzyl ester; Do.

(b) Cyanoacetic acid tetrahydroiurfuryl ester. Do- (a) Cyanoacetic acid a-phenylpropyl ester; D0.

(1)) Oyanoacetic acid benzyl ester. 1,3,3-trimethyl-5-methylsulph0nyl-2-methylene-indolene-w-alde- (a) Oyanoacetic acid benzyl ester; Do.

hyde (b) Cyanoacetrc acid phenoxyethyl ester. 1,3,3-trimethyl-5-carbobenzoxy-2-methylene-indolene-w-aldehyde- (a) Cyanoacetic acid benzyl ester; Do.

(b) Cyanoacetic acid 2-chlorobenzyl ester. Do (a) Oyanoacetic acid 'y-phenylpropyl ester; Do,

(b) Cyanoaeetic acid benzyl ester. 1,3,3-trimethy1-5-(N-ethyl)-carbani1ido-2-mcthylene-indolenew- (a) Cyanoacetic acid benzyl ester; D

aldehyde. (1)) Cyanoacetic acid ethyl ester. 1,3,3-trimetl1y1-5-phenylsulph0ny1-2-methylene-indolene-w- (a) Cyanoacetic acid benzyl ester; Do.

,1dehyde (b) Malonic acid dinitrile.

D (a) Oyanoacetic acid 'y-phenylpropyl ester; Do.

(b) Cyanoacetic acid benzyl ester. 1,3,3,7-tetramethyl-5-nitro-2-methylene-indclene-w-aldehyde (a) Gyanacetic acid benzyl ester; Do.

(b) Cyanoacetic acid 'y-phenylpropyl ester. 1,3,3,-trimethyl-5-ch1oro2-methy1ene-indolene-ereldehyde (a) Gyanoacetic acid benzyl ester; Do.

(1)) Cyanoacetic acid rphenylpropyl ester. D0 (a) Cyanoacetic acid -pheny1propyl ester; Do.

(b) Cyanoacetic acid phenoxyethyl ester. 1,3,3-trimethyl-5-ethoxy-2-methylene-indolene-w-aldehyde (a) Cyanacetic acid benzyl ester; Do.

(b) Cyancacetic acid 'y-phenylpropyl ester. (a) Oyanoacetic acid 'rphenylpropyl ester; D0. r (b) Cyanoacetic acid 3,4-dichlorobenzy1 ester. 1,3,3-trimethy1-5-methoxy-2-methylene-ind0lene1aaldeliyde (a) Cyanoaeetic acid 4-chl0r0benzyl ester; D0.

. (b) Cyanoacetic acid Zchlorobenzyl ester. 1,3,3-trimethy1-7etlty1-2-methylene-indolene-waldehyde (a) Oyanoacetic acid benzyl ester; D0.

(b) Cyanoacetic acid y-phenylpropyl ester. Do (a) Cyanoacetic adid 'y-pheuylpropyl ester; D0.

(b) Oyanoacetic acid phenoxyethyl ester. 1,3,3,7-1;etramethyl-Zqnethylene-indclene-w-aldehyde (a) Cyanoacetic acid benzyl ester; D0.

(b) Cyanoacetic acid 'y-phenylallyl ester. Do. (a) Cyanaocetic acid 'y-phenylpropyl ester; Do.

' (b) Cyanacetic acid benzyl ester. 1,3,3,5-tetramethyl-2methylene-indolene-w-aldehyde (a) Oyanaocetic acid 4-ch1orobenzy1 ester; Do.

(b) Cyanoacetic acid hydroxyethylamide. 1,3,3-trimethyl-5-amin0-2-methy1ene-indclene-w-aldehyde (a) Cyanoacetic acid benzyl ester; Do.

(b) Cyanoacetic acid ethyl ester. 1,3,3,7-tetramethy1-5-nitro-2-methylene-indolenew-aldehyde (a) Cyanoacetic acid 4-nitrobenzyl ester; Do.

(b) Cyanoacetic acid benzyl ester. 1,3,3-trimethyl'5-methoxy-2-methylene-indolene-waldehyde (a) Cyanoacetic acid 2-chlorobenzyl ester; Do.

(b) Oyanoacetic acid 3,4-dichlorobenzy1 ester. 1,3,3,7-tetramethyl-Q-methylene-indolene-w-aldehyde (a) Cyanoacetic acid 2 ch1oroberizy1 ester; Do.

(b) Cyanoacetic acid -chlorobenzyl ester. Do- (a) Cyanoacetic acid 3,4-dichlorobenzyl ester; D0.

(b) Cyanoacetic acid 2,4,6-trich1orobenzyl ester. Do- (a) Cyanoacetic acid 2,4,6-trich1orobenzyl ester; Do.

(b) Cyanoacetic acid phenoxyethyl ester. 1,3,3-trimethyl-S-methoxy-Z-methylene-u cyanoindolene-u1 (a) Cyancacetic acid 2-ch1oroberizy1 ester; Do.

aldehyde, (b) Cyanccaetic acid kchlorobenzyl ester.

Do- (a) Cyanoacetic acid 4-chlorobenzyl ester; Do.

(1)) Cyanoacetic acid 'y-PhBHYlPIOPYI ester. 1,3,3etrimethyl-5-meth0xy-2-methylene-indolene-u-a1dehyde (a) Oyanoacetic acid 8,4 dichl0robenzy1 ester; Do.

(b) Cyanoacetic acid 2,4,6-trichlor0benzyl ester.

Colour shade of dyestufi mixture on Aldehyde component Methylene compound polyamide fabric 1,3,3-trimethyl-fi-nitro-Z-methyIene-indOlene-waldehyde (a) Cyanoacetic acid 3,4-dichlorobenzy1 ester; Do.

(b) Cyanoacetic acid benzyl ester. 1,3,3-trimethyl-7-ethyl-2-methy1ene-indolenewaldehyde (a) Cyanoacetic acid 2-chlorobenzyl ester; Do;

I (b) Cyanoacetic acid 4-chlorobenzyl ester. 1,3,3-trimetl1yl-7-ethoxy-2-methylene-indolene-b-aldehyde (a) Cyanoaeetic acid 2-chlorobenzyl ester; D0.

(b) Cyanoacetic acid 3,4-dich1orobenzyl ester. 1,3,3-trimethyl-5-methoxy-2-methylene-indolenear-aldehyde (a) Cyanoacetic acid 2,4,6-trichlorobenzyl ester; D0.

(b) Cyanoacetic acid benzyl ester. 1,3,3-trimethyl-5-methoxy-2-methylene-w-cyanoindolene-m- (a) Cyanoacetic acid 2,4,6-trich1orobenzyl ester; Do:

aldehyde. (b) Oyanoacetic acid benzyl ester. 1,3,3,5tetramethyI-Z-methylene-indolsne-maldehyde (a) Cyanoacetic acid 2,4,6-trich1orobenzyl ester; D0.

(b) Cyanoacetic acid benzyl ester. 1,3,3-trimethyl-5-carbo-y-pheny1-pr0poxy-2-methylene-indolene-w (a) Cyanoacetic acid benzyl ester; D0.

aldehyde. (b) Gyanoacetic acid phenoxyethyl ester.

D0 (a) Cyanoacetic acid 'y-phenylpropyl ester; Do.-

(b) Cyanoacetic acid benzyl ester. 1,3,3,7-tetramethyl-5-chlorc-2-methyIene-indolene-w-aldchyde (a) Cyanoacetic acid benzyl ester; Do.

(b) Cyanoacetic acid 'y-phenylpropyl ester. Do (a) Cyanoacetic acid y-phenylpropyl ester; D0.

(b) Cyan'oacetic acid 'y-phenylallyl ester. 1,3,3,7-tetramethyl-4-chloro-2-methylene-1ndolene-w-a1dehyde (a) Oyanoacetic acid benzyl ester; D0.

(b) Cyanoacetic acid -phenylpropyl ester. Do (a) Cyanoacetic acid y-phenylpropyl ester; D0.

(b) Cyanoacetic acid methyl ester. 1,3,3,7-tetramethyl-6-chlorc-2-methylene-indolene-sraldehyde (a) Cyanoacetic acid benzyl ester; Do.

(b) Cyanoacetic acid ethyl ester. Do (a) Oyanoacetic acid 'y-phenylpropyl ester; D0.

(b) Cyanoacetic acid benzyl ester. 1,3,3-trimethyl-5-chlorc-7-methoxy-Z-methyIene-indOlene-Q (a) Cyanoacetic acid benzyl ester; D0.

aldehyde. (b) Oyanoacetic acid 'y-phenylpropyl ester.

Do (a) Cyanoacetic acid 'y-phenylpropyl ester; DO.

(b) Cyanoacetic acid ethyl ester. 1,3,3-trimethyl-4-chloro-7 methoxy-Z-methylene-indolene m- (a) Cyanoacetic acid benzyl ester; Do.

aldehyde. (b) Cyanoacetic acid ethyl ester.

Do (a) Cyanoacetic acid v-phenylpropyl ester; D0.

(b) Cyanoacetic acid benzyl ester. 1,3,3,7-tetramethyl-4-carbometlioxy-2 methylene-indolene-w- (a) Oyanoacetic acid benzyl ester; Do.

aldehyde. (b) Cyanoacctic acid y-phenylpropyl ester.

Do (a) Cyanoacetic acid 'y-phenylpropyl ester; DO:

(b) Cyancacetic acid ethyl ester. 1,3,3-trinietliyl-5-1i1ethoxy-2-metl1ylene-w-cyanoindolene-m- (a) Cyanoacetic acid -phenylallyl ester; D0:

aldehyde. 0)) Oyanoacetic acid y-phenylpropyl ester.

Do (a) Cyanoacetic acid phenoxyethyl ester; D0.

(h) Cyanoacetic acid tetrallydroiurfuryl ester. 1,3,3-trimetl1yl-4,6-dicarbomethexyQ-methylene-indolenc-w- (a) Oyancacetic acid benzyl ester; Do.

aldehyde. (b) Cyanoacetic acid ethyl ester.

D0 (a) Cyancacetic acid 'y-phenylpropyl ester; 0:

(b) Oyanoacetic acid benzyl ester. 1,3,3-trimethyl-4,5-dichloro-7-methorny-2methylene-indolene-w- (a) Cyanoacetic acid benzyl ester;

aldehyde. (b) Cyanoacetic acid 'y-phenylpropyl ester.

Do (a) Oyancacetic acid 'y-phenylpropyl ester;

(b) Cyanoacetic acid ethyl ester. I,3,3-trimethyl-5ch1or0-4,7-dlmet hoxy-2-methylene-indolene-w (a) Cyanoacetic acid benzyl ester; D0.

aldehyde. (b) Cyanoacetic acid ethyl ester.

Do (a) Cyanoaeetic acid v-phenylpropyl ester; D

(b) Cyanoacetic acid benzyl ester. 1,3,3,4-tetramethyl-5-chloro-7-meth0xy-2methylene-indolene-w- (a) Oyanoacetic acid benzyl ester; DO.

aldehyde. (b) Cyanoacetic acid 'r-phenylpropyl ester.-

Do (a) Cyanoacetic acid -phenylpropyl ester; D0.

(b) Gyanoacetic acid ethyl ester. 1,3,3-trtmethyl-E-carbow-phenylpropoxy-2-methylene-indolene- (a) Cyanoacetic acid benzyl ester; Do.

w-aldehyde. (b) Malonic acid dinitrile. 1,3,3-trimethyl-5-carb0methoxy-2-methylene-mdolene-m-aldehyde. (a) Cyanoacetic acid benzyl ester; D0.

(b) Oyanoacetic acid methyl ester. 1,3,3-t1imethyl-5-cyano-2-methylene-indolene-w-aldehyde (a) Cyanoacetic acid benzyl ester; D0.

(b) Oyanoacetic acid ethyl ester. 1,3,3trimethyl-5-pheny1sulphonyl-2-methylene-indoleue-w-alde- (a) Cyanoacetic acid benzyl ester; Do.

by e. (b) Cyanoacetic acid ethyl ester. 1,3,3-trimethyl-5-carbomethoxy-2-methylene-indolene-w-aldehyde. (a) Cyanoacetic acid benzyl ester; Do.

(b) Cyanoacetic acid methyl ester. Do... (a) Oyanoacetic acid benzyl ester; D0-

(b) Cyanoacetic acid cyclohexyl ester. Do (a) Cyanoacetic acid benzyl ester; D0.

(b) Cyanoacetic acid 4-metl1ylcycl0hexyl ester. Do Cy noacetic acid benzyl ester; (b) Cyanoacetic acid N-cyclohexylamide. 1,3,3-trimethyl-5-cyano-2-methylene-mdolene-w-aldehyde (a) Oyanoacetic acid benzyl ester; Do.

(b) Malonic acid dinitrile. 1,3,3-trimethyl-5-carbo-y-phenyl-propoxy-Z-methylcne-mdolcne- (a) Cyanoacetic acid benzyl ester; Do.

waldehyde. (b) Cyanoacetamide.

D0 (a) Cyancacetic acid 3,4-dlchlorobenzyl ester: D0-

Oyanoacetic acid 2,4,6-trichlorobenzyl ester; (c) Cyanoacetic acid benzyl ester. Do (a) Oyanoacetic acid benzyl ester; D0.

(b) Cyanoacetic acid isopropyl ester. Do (a) Cyanoacetic acid benzyl ester; D0.

(b) Cyanoacetic acid isobutyl ester. Do (a) Cyanoacetic acid benzyl ester; Do.

(b) Cyanoacetic acid isoamyl ester. D0 (a) Cyanoacetic acid benzyl ester; D0.

(b) Cyanoacetic acid 4-methoxy-n-butyl cstcr. Do (a) Cyanoacetic acid benzyl ester; D0.

(b) Cyanoacetic acid 1,3-dichl0roisopr0pyl ester. D0 (a) Cyanoacetic acid benzyl ester; Do.

(b) Gyanoacetic acid N-etliylanilide. D0 (a) Cyanoacetic acid benzyl ester; Do.

(b) Cyanoacetic acid N-methylanilide. Do (a) Cyanoacetic acid benzyl ester; D0.

(b) Cyanoacetic acid tetrahydrofurfuryl ester. Do (a) Cyanoacetic acid benzyl ester; Do.

(b) Cyanoacetic acid B-chlorcethyl ester. Do (a) Cyanoacetic acid benzyl ester; Do.

(b) Cyanoacetic acid B-methylamlnoethyl ester. Do (a) Cyanoacetic acid benzyl ester; Do;

(b) Cyanoacetic acid fi-hydroxyethyl ester.

13 14 We claim: 3. A dyestuflf of claim 2 wherein X stands for OCH; 1. A dyestufi of the formula: or COOCH and R stands for CN.

X B1 4. A dyestuif of claim 2 wherein R stands for o-R CN =CCH=C Z l coom CHaCHrCHr-Q, orn-Qor in which CHr-CH=CH or cmom-o R, R and R are methyl or ethyl; R is hydrogen or cyano; R is phenyl alkyl having 1 to 3 carbon atoms in the alkyl group, phenyl alkyl having 1 to 3 carbons in the alkyl'group and having a hydroxy substituent in the alkyl group, phenyl alkyl having 1 to 3 carbon 5. The dyestuif of the formula atoms in the alkyl group and substituted with chloro, 6. The dyestufi of the formula nitro or methyl in the phenyl group, phenoxyethyl, or phenylallyl in which R; is linked to O via said alkyl or allyl group; CN X is hydrogen, halogen, amino, nitro, cyano, methyl, ethyl, methoxy, ethoxy, carbonmethoxy, carbethoxy, CCH=C\ carbophenyloxy, and carbophenyl lower alkoxy in N COO-CH;- which the lower alkoxy group contains 1-3 carbon atoms; 7. The dyestufi of the formula CH1 @om-omomooc l CH;

CN CHCH=O I coo-cm-C} CH:

8. The dyestufi of the formula Y is hydrogen, halogen, methyl, ethyl, methoxy, ethoxy, CH

carbomethoxy, carbethoxy, methyl sulfonyl, phenylsulfonyl, carboxamide, and carboxamide substituted CH3) ON with lower alkyl of 1 to 2 carbon atoms, phenyl or 5 benzyl; and Z is hydrogen, methyl, ethyl, methoxy, ethoxy or halo- CH coo-cm-onwnQ gen.

9. The dyestufi of the formula cm Gem-00c i om l ON N/=CHOH=C I cm 0 o 0cH,-

2. A dyestuit of the formula: 10. The dyestuff of the formula on, x (z-cm 1 (I: CHSO on.

=OCH=C N/ in coorw =o-cn=c X is methoxy, ethoxy, carbomethoxy, carbethoxy or carbophenyl lower alkoxy in which the lower alkoxy The dyesmfi 0f the m a group contains 1 to 3 carbon atoms; R is hydrogen or cyano; OH: R, is phenyl alkyl having 1 to 3 carbon atoms in the alkyl group, phenylallyl, phenoxyethyl, or phenyl 0N alkyl having 1 to 3 carbon atoms in the alkyl group c c =c and substituted in the phenyl group with chloro, nitro f l or methyl.

16 12. The dyestufi of the formula 18. A dyestufi mixture containing the dyestuffs on, CH300C-- I CH5 CH3 I CHaOOC- CH CHCH=C & 3 UN N J= l COOCH:-CH CH-CH=C 13. The dyestuif of the formula CH3 2 CH: CHgO- H: CH3

CN HaCOOC CH3 I coo-om-cm-cm- 14. The dyestufi of the formula CH3 CH3 B10000 CH:

19. A dyestufi mixture containing the dyestuffs 15. The dyestulf of the formula CH:

GHaOOC CH3 /CN CH: CHCH=C c1110 H: CN C0OCHa- CI CH: c-cH=c I 011 N 5 G 0 CH 3 1 N o 0111000 CH3 35 CHOH=G 16. The dyestuff of the formula CH: -cmooc- Ha N GH-CH=C\ j C00CH:OHgCH References Cited UNITED STATES PATENTS 1 T e dye t i of t e formula 3,255,204 6/1966 Raue et a1 260-240 3,149,146 9/1964 Strobel et a1 260-240 2,693,472 11/1954 Kendall et a1 260--240 01% HENRY R. JILES, Primary Examiner CH3 0N HARRY I. MOATZ, Assistant Examiner \N 01I-0H= us. 01. X.R.

I coo-cm- 8-55; 260-240, 326.12, 326.13, 326.14, 326.15, 326.16, 

